Consider that, if the time separation is long enough via light then physical limits make it such that we do not ever have a chance of contact in which case this

Consider that, if the time separation is long enough via light then physical limits make it such that we do not ever have a chance of contact in which case this exchange is essentially indistinguishable from communication with supernatural beings. Not that I believe they are the same, but many people will come to this conclusion and they would not be probably wrong. Causality is strange.